Henry's 36-year-old son, Derek, was shot and killed Wednesday night. Police have charged Soldridge's 38-year-old son, Barry Jr., in his death and that of Candice Shuey, 22.

"Like all of us, we're all still in shock and it's not [Donna's] fault this happened," Henry said. "She said something in Barry must have snapped."

Some friends and family of the men have said jealousy over Shuey sparked the shooting. Henry does not believe that. She said Shuey broke up with Soldridge about a year ago and both had put that behind them.

"Barry said it was fine that Candice had moved on and what a nice guy Derek was," Henry said. "Things seemed to be OK."

She also said Shuey wanted to remain friends with her former boyfriend.

"Candice didn't want this to tear them apart," Henry said. "We're all still unsure why things changed all of a sudden."

On Friday afternoon, investigators were still looking for a murder weapon. State police searched a small pond near the home at 7437 Christmas Lane in Washington Township, Lehigh County, where Soldridge was arrested Thursday.

Police have charged Soldridge with homicide, alleging he opened fire on the couple at a friend's house with a high-powered rifle, fled and confessed to his mother that he had killed Derek Henry, according to court records.

Soldridge remains in Northampton County Prison without bail. Prosecutors said they believe the killings were premeditated and that they'll prosecute it as a capital case.

When Soldridge came to a friend's home Wednesday night and saw Shuey and Henry there, an argument broke out, police said. Soldridge went to his parents' home, kicked open a bedroom door and grabbed a rifle, according to court documents, then returned to the friend's home and killed Henry and Shuey.

Linda Henry said her son and Soldridge were third cousins. Before Soldridge broke up with Shuey, he worked on her son's beloved Camaro, Henry said. She said while the two men were friendly with each other, they didn't hang out together.

When her son began dating Shuey, Henry said, the change in him was immediate. It was his first serious relationship and he told his mother he was in love.

She said Shuey and Derek were inseparable — they would ride all-terrain vehicles in the woods and go on fishing trips.

"They were like young teenagers who had just discovered each other," Henry said.